Flashing the Xbox 360 is the first step to modding the console. It allows you to modify the firmware on the consoles disk drive to make it read burned discs. You will need to buy this and this. Then you need to disassemble your Xbox 360; we have several videos on the site detailing how to do this, like this one. Now, download this, connect your Xbox's drive to your computer, and follow the rest of the steps.